CN103021238B - Digital static tester - Google Patents
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- CN103021238B CN103021238B CN201210521414.XA CN201210521414A CN103021238B CN 103021238 B CN103021238 B CN 103021238B CN 201210521414 A CN201210521414 A CN 201210521414A CN 103021238 B CN103021238 B CN 103021238B
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Abstract
The invention provides a digital static tester which comprises a signal processing circuit, a master control circuit, a liquid crystal display circuit, a power source circuit, a wireless emission circuit and a wireless receiving circuit. The signal processing circuit, the master control circuit, the liquid crystal display circuit and the wireless transmission circuit are all connected with the power source circuit, the signal processing circuit is connected with the master control circuit, the liquid crystal display circuit and the wireless transmission circuit are both connected with the master control circuit, and the wireless transmission circuit is in Bluetooth wireless communication connection with the wireless receiving module. The digital static tester is provided with a large-capacitance circuit, the electrified potential is correspondingly reduced, and by means of a digital signal collecting function, data in a static test can be displayed, recorded and stored in dynamic real-time mode. The digital static tester can display whether charges are large or small and can display whether the charges are positive or negative in quantitative mode, is free of influence from the external environment and reliable to use, and has the advantages of being capable of indicating polarity, high and adjustable in sensitivity, capable of performing quantitative research and process research and capable of being used in large-scale demonstration and the like.
Description
Technical field
The present invention relates to a kind of tester for the measurement of electrostatic quantity of electric charge, belong to electrostatic experiment technical field.
Background technology
Static is a part very unique in physics teaching in secondary school content, is also that student is very difficult to a part of understanding.Its uniqueness is that the correlation degree of this part content and other parts is little, relatively isolated, and comparatively abstract; But because be the rudimentary knowledge of rare student can be led atomic physics and even quantum theory in physics teaching in secondary school, static content is indispensable.Due to the characteristic of static and the restriction of traditional experiment instrument, cause electrostatic experiment difficulty to be done, cause student's indigestion.Traditional electrometer has adopted " condenser type " structure, by instrument itself, has formed electric capacity, therefore, keeps insulation good (comprising that air is dry) and equipment clean, becomes Success in Experiment whether key.But due to the restriction of experimental situation, in experiment, the as easy as rolling off a log impact that is subject to air humidity or temperature is leaked electricity, and causes the success ratio of experiment not high.Traditional electrometer also has the defect of two aspects, there is no the data of quantification, can only judge qualitatively by the inclined to one side size of pointer the size of electric charge, can not distinguish the polarity of electric charge.
Summary of the invention
The present invention is directed to the deficiency that existing electrostatic experiment technology exists, provide a kind of and be not subject to external environment influence, can show the digital electrostatic experiment device that electric charge is positive and negative and carry out quantitative examination.
Digital electrostatic experiment device of the present invention is by the following technical solutions:
This numeral electrostatic experiment device, comprises signal conditioning circuit, governor circuit, liquid crystal display circuit, power circuit
,radio transmitter and wireless receiving module; Signal conditioning circuit, governor circuit, liquid crystal display circuit and radio transmitter are all connected with power circuit, signal conditioning circuit is connected with governor circuit, liquid crystal display circuit is all connected with governor circuit with radio transmitter, between radio transmitter and wireless receiving module, adopts blue tooth wireless communication to be connected; Wireless receiving module comprises wireless receiving circuit, Data Analysis circuit, usb circuit and feed circuit, wireless receiving circuit is connected with Data Analysis circuit, Data Analysis circuit is connected with usb circuit, and wireless receiving circuit, Data Analysis circuit and usb circuit are all connected with feed circuit.
Signal conditioning circuit, comprises inductive head, capacitor C 24, reed switch relay U8, zeroing button S1, high input impedance operational amplifier U6 and dual operational amplifier U9; Inductive head is connected to capacitor C 24 through resistance R 18, capacitor C 24 one end ground connection, and the other end is connected to operational amplifier U6, and operational amplifier U6 is connected with dual operational amplifier U9, and dual operational amplifier U9 is connected with the single-chip microcomputer U2 in governor circuit; Reed switch relay U8 and zeroing button S1 form zeroing circuit, and zeroing button S1 is connected with reed switch relay U8, and reed switch relay U8 is connected with the voltage output end of capacitor C 24 on the one hand, on the one hand ground connection.
Governor circuit, comprises single-chip microcomputer U2, download interface and battery power detection circuit (resistance R 30 and R31); Download interface is all connected with single-chip microcomputer U2 with battery power detection circuit.
Liquid crystal display circuit, comprises lcd driver U5, liquid crystal display and field effect transistor Q1, and liquid crystal display is connected with lcd driver U5, and field effect transistor Q1 is connected with liquid crystal display, and lcd driver U5 is connected with the single-chip microcomputer U2 in governor circuit.
Power circuit, comprises on/off circuit, mu balanced circuit, positive-negative power circuit and reference source circuit four parts; On/off circuit is by field effect transistor Q2 and switching on and shutting down button S2; Mu balanced circuit is used voltage stabilizing chip U1, the power supply of being inputted is stabilized to 3.3V voltage, for governor circuit, liquid crystal display circuit, wireless communication line provide power supply by on/off circuit; Generating positive and negative voltage circuit adopts positive-negative power chip U7, and output ± 15V voltage provides positive-negative power for signal conditioning circuit; Reference source circuit adopts reference source chip U3, and the very little 2.5V voltage of stable output ripple provides voltage reference for the inner ADC module of the single-chip microcomputer in governor circuit.
Radio transmitter, comprises from bluetooth serial ports module U4 and field effect transistor Q4, from bluetooth serial ports module U4, is connected with the single-chip microcomputer U2 governor circuit, and field effect transistor Q4 is connected with from bluetooth serial ports module U4 and is connected with the single-chip microcomputer U2 governor circuit.
Wireless receiving circuit in wireless receiving module, comprise main bluetooth serial ports module U11, Bluetooth pairing pilot lamp D7 and pairing button S2, main bluetooth serial ports module U11 is connected with Bluetooth pairing pilot lamp D7, pilot lamp D7 be used to indicate main bluetooth serial ports module U11 whether with from the successful matching of bluetooth serial ports module, pairing button S2 is connected with main bluetooth serial ports module U11.Main bluetooth serial ports module U11 receives the electromagnetic wave from bluetooth serial ports module U4 transmitting of pairing with it, and by interior data information analysis out, sends to Data Analysis circuit.
Data Analysis circuit in wireless receiving module, comprise single-chip microcomputer U10 and program download interface J3, program download interface is connected with single-chip microcomputer U10, for the program of single-chip microcomputer U10, downloads, the data that single-chip microcomputer U10 sends for receiving main bluetooth serial ports module U11, and carry out Data Analysis.
Interface circuit in wireless receiving module, comprises Transient Suppression Diode TVS1 and USB interface, and Transient Suppression Diode TVS1 connects USB interface and single-chip microcomputer U10, and data communication is played to electrostatic protective function, and USB interface is for being connected with outer computer.
The feed circuit of wireless receiving module, comprise voltage stabilizing chip U12, for output+3.3V voltage after the voltage stabilizing of general+5V voltage.
Wireless receiving module is connected with computing machine, turns on the power switch, and flicking zeroing button, make liquid crystal display be shown as zero.Use the glass bar or the rubber bar that rubbed to come close to or in contact with input end (inductive head), liquid crystal display will show current electrostatic charge.The quantity of electric charge that Computer display is current and quantity of electric charge oscillography show.
The present invention is provided with high-c circuit, electric capacity than conventional electrostatic meter large several magnitudes, the also corresponding reduction of electromotive force after charged, by digitized signals collecting function, can carry out real-time dynamic display and record storage to the data in electrostatic experiment.Not only can quantitatively show the size of electric charge, and can show the positive and negative of electric charge, not affected by external environmental factor, use reliably, have that polarity indication, high sensitivity and sensitivity are adjustable, quantitative examination, process study, can be for features such as large-scale demonstrations.
accompanying drawing explanationquiet
Fig. 1 is the Facad structure schematic diagram of the present invention's numeral electrostatic experiment device.
Fig. 2 is the reverse side structural representation of the present invention's numeral electrostatic experiment device.
Fig. 3 is the circuit theory diagrams of signal conditioning circuit in the present invention.
Fig. 4 is the circuit theory diagrams of governor circuit in the present invention.
Fig. 5 is the circuit theory diagrams of liquid crystal display circuit in the present invention.
Fig. 6 is the circuit theory diagrams of mu balanced circuit in the present invention.
Fig. 7 is the circuit theory diagrams of on/off circuit in the present invention.
Fig. 8 is the circuit theory diagrams of positive-negative power circuit in the present invention.
Fig. 9 is the circuit theory diagrams of reference source circuit in the present invention.
Figure 10 is the circuit theory diagrams of radio transmitter in the present invention.
Figure 11 is the circuit theory diagrams of wireless receiving module in the present invention.
Figure 12 is the circuit theory diagrams of the Data Analysis circuit of wireless receiving module in the present invention.
Figure 13 is the circuit theory diagrams of the usb circuit of wireless receiving module in the present invention.
Figure 14 is the circuit theory diagrams of the feed circuit of wireless receiving module in the present invention.
Wherein: 1, power switch, 2, zeroing button, 3, input end, 4, liquid crystal display, 5, support, 6, ground wire plug, 7, battery compartment.
Embodiment
Electrostatic experiment device of the present invention is one and comprises signal conditioning circuit, governor circuit, liquid crystal display circuit, power circuit
,radio transmitter, wireless receiving module and computer software are at interior experiment teaching system, and wherein signal conditioning circuit, governor circuit, liquid crystal display circuit, power circuit and radio transmitter form electrometer.Wherein power circuit comprises again mu balanced circuit, on/off circuit, positive-negative power circuit, reference source circuit.Power circuit provides power supply for whole circuit, signal conditioning circuit is connected with governor circuit, the various signals of signal conditioning circuit collection are delivered to governor circuit and are processed, governor circuit is connected with radio transmitter with liquid crystal display circuit, and the digital signal of handling well is shown and can deliver to radio transmitter by serial interface at liquid crystal display.Between radio transmitter and wireless receiving module, adopt blue tooth wireless communication, wireless receiving module is uploaded to computing machine by experimental data, and the software in computing machine carries out data processing.
As depicted in figs. 1 and 2, right side is provided with power switch 1 to the outward appearance of electrostatic experiment device, and upper right side is provided with zeroing button 2, and upper left side is provided with input end 3, and front arranges liquid crystal display 4, and bottom is provided with support 5.As shown in Figure 2, bottom, the left side is provided with ground receptacle 6.Electrometer bottom surface is provided with battery compartment 7, and what in battery compartment 7, install is the lithium battery of nominal 3.7V.
Annex has spherical input end, faraday cylinder, zine plate, barricade.According to different experiments, can change different annexes, faraday cylinder can be done the experiment of two kinds of electric charges, and zine plate can be used for doing photoelectric effect experiment, and spherical input end and barricade combination can be used for doing electrostatic screening experiment.
During experiment, wireless receiving module is connected with computing machine, clicks and press power switch 1, power-on.Click zeroing button 2, what make liquid crystal display 4 is shown as zero.The object proximity of static electrification or contact electrometer input end 3 time, signal conditioning circuit amplifies adjustment to electric signal.Single-chip microcomputer U2 in governor circuit processes and changes into digital signal, subsequently signal data is shown on liquid crystal display 4, and sends by radio transmitter.Wireless receiving module receives after signal, and the single-chip microcomputer U1 in Data Analysis circuit carries out Data Analysis, and by USB mouth, resolution data is uploaded to computing machine.Computing machine will show the size of electrostatic charge in real time according to the data that obtain, and can oscillography show data.Measurements and calculations result all shows by computer software, and can carry out by man-machine interaction processing and the application of original measurement result.Computer software adopts VC++ exploitation, and installation and operation is in the mainstream operation systems such as WindowsXP, Windows7, and built-in formula storehouse and algorithms library, support the demand of middle school physical experiment data processing.
Signal conditioning circuit as shown in Figure 3, mainly comprises that inductive head, base propylene capacitor C 24, reed switch relay U8, zeroing button S1(are the zeroing button 2 in Fig. 1), high input impedance operational amplifier U6(INA116UA) and dual operational amplifier U9(TL062).Capacitor C 24 is base propylene electric capacity, and electric capacity is 10000pF, and polypropylene capactive is nonpolarity, and insulation impedance is very high, frequency characteristic excellent (frequency response is broad), and also dielectric loss is very little.Advantage based on above, can effectively guarantee that the electric charge of electric capacity storage can not leak not at short notice.Inductive head is connected to base propylene capacitor C 24 through resistance R 18, and when the object proximity with static or contact induction head (input end), electric charge will charge to capacitor C 24, at the two ends of capacitor C 24, can form electric potential difference.From C=Q/U, the voltage U at capacitor C 24 two ends is directly proportional to the charge Q of inflow.Capacitor C 24 one end ground connection, the other end is connected to operational amplifier U6(INA116UA), the input impedance of INA116UA is greater than 10
15Ω, leakage current is minimum, therefore can guarantee that the electric charge of capacitor C 24 can not run off very soon.Signal after the impedance transformation of operational amplifier U6 inputs to dual operational amplifier U9 and amplifies, adjusts, to meet the input requirements of the ADC of single-chip microcomputer U2.The output pin of INA116UA is connected to dual operational amplifier U9(TL062 after R24, R27 electric resistance partial pressure).Signal exports governor circuit to by the 7th pin after dual operational amplifier U9 amplifies.Because electric charge is difficult to miss in electric capacity, in order to carry out fast revision test, therefore increased zeroing circuit, zeroing circuit is comprised of return to zero button S1 and reed switch relay U8, zeroing button S1 is connected with reed switch relay U8,1 pin of reed switch relay U8 is connected with the voltage output end of polypropylene capactive C24,3, the 4 pin ground connection of reed switch relay U8.When zeroing button S1 presses, 2 pin of reed switch relay U8 have voltage input, and 1 pin of reed switch relay U8 just can be connected with ground inner, and the electric charge in base propylene capacitor C 24 just can pour off very soon.
Governor circuit as shown in Figure 4, comprises single-chip microcomputer U2(C8051F410), download interface and battery power detection circuit (resistance R 30 and R31).The output signal of signal conditioning circuit is connected to the 29th pin of single-chip microcomputer U2, and this pin is the input pin of Chip Microcomputer A/D C by single-chip microcomputer application configuration, and single-chip microcomputer U2 carries out AD sampling to signal.Download interface is all connected with single-chip microcomputer U2 with battery power detection circuit.The 21st, 22 serial port pin of single-chip microcomputer U2 are connected to radio transmitter.The 17th, 18,19,20 pin of single-chip microcomputer U2 are connected to liquid crystal display circuit.Data after single-chip microcomputer U2 processes can show on liquid crystal display, also can transfer to wireless receiving module by radio transmitter.Resistance R 30 and R31 are connected to the 24th pin of single-chip microcomputer U2 after to lithium battery voltage dividing potential drop, the 24th pin is configured to the input pin of ADC, single-chip microcomputer U2 carries out the electric quantity data of the rear judgement of AD sampling lithium battery, and by information about power in liquid crystal screen display, when electric weight is during lower than minimum threshold values, single-chip microcomputer U2 is by powered-down circuit.Single-chip microcomputer U2 is by the on/off of the 16th foot control radio transmitter processed.
Liquid crystal display circuit as shown in Figure 5, mainly comprises that lcd driver U5(segment liquid crystal screen drives chip HT1621B), liquid crystal display (the segment liquid crystal screen lcd1 of customization) and field effect transistor Q1(AO3401).HT1621B is 128 points, memory mapping and multi-functional lcd driver, the 9th, 10,11,12 pin of HT1621B are connected to single-chip microcomputer U2, the SEG[0:19 of HT1621B] be connected to successively the SEG[0:19 of liquid crystal display] pin, single-chip microcomputer U2 is by the data transmission showing to HT1621B, and HT1621B realizes the demonstration of segment liquid crystal screen is refreshed.Field effect transistor Q1 is connected with backlight board of liquid crystal screen, liquid crystal display backlight by field effect transistor Q1 by Single-chip Controlling, field effect transistor Q1(AO3401) LCD_EN signal wire be connected to single-chip microcomputer U2, can control liquid crystal display light on and off backlight.
The mu balanced circuit of power circuit as shown in Figure 6, mainly comprises voltage stabilizing chip U1(LTC3440EMS).Voltage stabilizing chip U1 and peripheral circuits can be converted into stable 3.3V voltage through power supply input, for whole other circuit provides 3.3V power supply.
The on/off circuit of power circuit as shown in Figure 7, mainly comprises 1 joint 3.7V nominal lithium battery BT1, field effect transistor Q2.Lithium battery BT1 is connected to on/off circuit, and when switching on and shutting down button S2 presses, boot-strap circuit makes field effect transistor Q2 conducting, push button signalling is reached to the P1.6 pin of single-chip microcomputer U2 simultaneously, single-chip microcomputer U2 detects push button signalling, by P1.5 foot control field effect transistor Q2 state processed, locks, and completes start.When switching on and shutting down button is pressed again, single-chip microcomputer U2 detects push button signalling, controls P1.5 pin, makes field effect transistor Q2 cut-off, completes shutdown.
The positive negative circuit of power circuit as shown in Figure 8, adopts positive-negative power chip U7(LTC1945).Positive-negative power chip U7 can stablize output ± 15V voltage, for operational amplifier U6 in signal conditioning circuit and dual operational amplifier U9 provide positive-negative power.
The reference source circuit of power circuit as shown in Figure 9, mainly comprises reference source chip U3(ADR391AUJZ).Reference source chip U3 can the very little 2.5V voltage of output ripple, and output is connected to the 11st pin (VREF pin) of single-chip microcomputer U2, for the adc circuit of single-chip microcomputer U2 inside provides stable reference source, guarantees that ADC sampled value obtains accurate stable.
Radio transmitter as shown in figure 10, mainly comprises from bluetooth serial ports module U4 and field effect transistor Q4.From the 1st, 2 pin of bluetooth serial ports module U4, be connected with single-chip microcomputer U2 the 21st, 22 pin.Field effect transistor Q4 is connected and is connected with 16 pin of single-chip microcomputer U2 governor circuit with 12 pin from bluetooth serial ports module U4.Field effect transistor Q4 is the power supply with flexible switch bluetooth module by the 16 foot control systems of single-chip microcomputer U2.
Wireless receiving module comprises wireless receiving circuit, Data Analysis circuit, usb circuit and feed circuit, wireless receiving circuit is connected with Data Analysis circuit, Data Analysis circuit is connected with usb circuit, wireless receiving circuit, Data Analysis circuit and usb circuit are all connected with feed circuit, and feed circuit provide power supply for other circuit.
The wireless receiving circuit of wireless receiving module as shown in figure 11, comprises main bluetooth serial ports module U11, Bluetooth pairing pilot lamp D7 and pairing button S2.Main bluetooth serial ports module U11 receives the 2.4GHz electromagnetic wave from the transmitting of bluetooth serial ports module of pairing with it, and by interior data information analysis out, by serial interface, sends to Data Analysis circuit.Main bluetooth serial ports module U11 is connected with Bluetooth pairing pilot lamp D7, pilot lamp D7 be used to indicate main bluetooth serial ports module whether with from the successful matching of bluetooth serial ports module.Pairing button S2 is connected with the 26th pin of main bluetooth serial ports module U11, and while pressing, main bluetooth serial ports module U11 will search for again from bluetooth serial ports module U4, automatic matching.
The Data Analysis circuit of wireless receiving module as shown in figure 12, mainly comprises single-chip microcomputer U10 and program download interface J3.The data that single-chip microcomputer U10 sends for receiving main bluetooth serial ports module, and carried out Data Analysis, then be uploaded to computing machine by interface circuit.Program download interface is connected to the 13rd, 14 pin of single-chip microcomputer U10, for the program of single-chip microcomputer U10, downloads.
The interface circuit of wireless receiving module as shown in figure 13, mainly comprises Transient Suppression Diode TVS1 and USB interface.Transient Suppression Diode TVS1 connects the 8th, 9 pin of USB interface and single-chip microcomputer U10, and data communication is played to electrostatic protective function, and USB interface is connected with computing machine.
The feed circuit of wireless receiving module as shown in figure 14, mainly comprise voltage stabilizing chip U12, and+5V voltage connects the 1st, 3 pin of voltage stabilizing chip U12, after its voltage stabilizing from the 5th pin output+3.3V voltage.
The experiment model of above-mentioned electrostatic experiment device is as described below:
Wireless receiving module is accessed to computing machine, turn on the power switch 1, and flicking zeroing button 2, now liquid crystal display 4 is shown as zero.Wireless sign flicker during start on liquid crystal display 4, complete with wireless receiving module pairing when radio transmitter, wireless sign lights no longer glimmers.
The rubber bar that the glass bar that use silk rubbed or fur rubbed comes close to or in contact with input end (inductive head), and liquid crystal display 4 will show current electrostatic charge.Open computing machine special software, click " starting record ", computer software starts to show the current quantity of electric charge, clicks " oscillography " button, and quantity of electric charge oscillography shows.
The present invention has following feature:
1, polarity indication: when needs judge polarity chron, conventional electrostatic meter must have a reference charge, and electrometer of the present invention can directly be indicated polarity.
2, high sensitivity and sensitivity are adjustable: sensitivity of the present invention is significantly higher than conventional electrostatic meter and sensitivity can be adjusted, and the scope of electrostatic experiment can expand because of the upgrading of survey instrument.
3, quantitative examination a: considerable advantage of the present invention has been linear scale, compares with conventional electrostatic meter that can only rough measure, and precision is higher.Therefore can verify that physical law is linearity or exponential relationship with the present invention.This makes to have departed from qualitative observation state in experiment, has entered into measurement, analysis phase.Not only the size of electric charge can be quantitatively shown, and the positive and negative of electric charge can be shown.
4, process study: the present invention can show, record by oscillography display mode the process of electrostatic experiment real-time dynamicly.
5, can be for large-scale demonstration: be connected with computing machine, special software has the plurality of display modes such as numeral, oscillography, instrument, can with the modernization audio-visual education programme means couplings such as projection, blank.
Claims (1)
1. a digital electrostatic experiment device, comprises signal conditioning circuit, governor circuit, liquid crystal display circuit, power circuit, radio transmitter and wireless receiving module; It is characterized in that: signal conditioning circuit, governor circuit, liquid crystal display circuit and radio transmitter are all connected with power circuit, signal conditioning circuit is connected with governor circuit, liquid crystal display circuit is all connected with governor circuit with radio transmitter, between radio transmitter and wireless receiving module, adopts blue tooth wireless communication to be connected; Wireless receiving module comprises wireless receiving circuit, Data Analysis circuit, usb circuit and feed circuit, wireless receiving circuit is connected with Data Analysis circuit, Data Analysis circuit is connected with usb circuit, and wireless receiving circuit, Data Analysis circuit and usb circuit are all connected with feed circuit; Described signal conditioning circuit comprises inductive head, capacitor C 24, reed switch relay U8, zeroing button S1, high input impedance operational amplifier U6 and dual operational amplifier U9; Inductive head is connected to capacitor C 24 through resistance R 18, capacitor C 24 one end ground connection, and the other end is connected to operational amplifier U6, and operational amplifier U6 is connected with dual operational amplifier U9, and dual operational amplifier U9 is connected with the single-chip microcomputer U2 in governor circuit; Reed switch relay U8 and zeroing button S1 form zeroing circuit, and zeroing button S1 is connected with reed switch relay U8, and reed switch relay U8 is connected with the voltage output end of capacitor C 24 on the one hand, on the one hand ground connection.
2. digital electrostatic experiment device according to claim 1, it is characterized in that: described radio transmitter, comprise from bluetooth serial ports module U4 and field effect transistor Q4, from bluetooth serial ports module U4, be connected with the single-chip microcomputer U2 governor circuit, field effect transistor Q4 is connected with from bluetooth serial ports module U4 and is connected with the single-chip microcomputer U2 governor circuit; Wireless receiving circuit in described wireless receiving module, comprise main bluetooth serial ports module U11, Bluetooth pairing pilot lamp D7 and pairing button S2, main bluetooth serial ports module U11 is connected with Bluetooth pairing pilot lamp D7, pilot lamp D7 be used to indicate main bluetooth serial ports module U11 whether with from the successful matching of bluetooth serial ports module, pairing button S2 is connected with main bluetooth serial ports module U11, main bluetooth serial ports module U11 receives the electromagnetic wave from bluetooth serial ports module U4 transmitting of pairing with it, and by interior data information analysis out, send to Data Analysis circuit; Data Analysis circuit in described wireless receiving module, comprise single-chip microcomputer U10 and program download interface J3, program download interface is connected with single-chip microcomputer U10, for the program of single-chip microcomputer U10, downloads, the data that single-chip microcomputer U10 sends for receiving main bluetooth serial ports module U11, and carry out Data Analysis; Interface circuit in described wireless receiving module; comprise Transient Suppression Diode TVS1 and USB interface; Transient Suppression Diode TVS1 connects USB interface and single-chip microcomputer U10, and data communication is played to electrostatic protective function, and USB interface is for being connected with outer computer.
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| CN201210521414.XA CN103021238B (en) | 2012-12-07 | 2012-12-07 | Digital static tester |
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| CN201210521414.XA CN103021238B (en) | 2012-12-07 | 2012-12-07 | Digital static tester |
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| CN103021238B true CN103021238B (en) | 2014-10-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107591067A (en) * | 2016-07-06 | 2018-01-16 | 陈强 | Electrometer for middle school's electrostatic experiment |
| CN108806432A (en) * | 2018-06-25 | 2018-11-13 | 江苏苏威尔科技有限公司 | A kind of high-pressure electrostatic experiment external member and its application method |
| CN109323133A (en) * | 2018-12-04 | 2019-02-12 | 济南市长清计算机应用公司 | A kind of adjustable fuel gas acousto-optic leak detector of sensitivity and the method for judging combustible gas leakage point |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2064512U (en) * | 1989-04-05 | 1990-10-24 | 内蒙古武川第一中学 | Positive and negative charges' displays |
| CN2126741Y (en) * | 1990-10-08 | 1993-02-03 | 唐振山 | Ch-2290 shape electrostatic voltage measuring device |
| CN2165453Y (en) * | 1993-06-01 | 1994-05-18 | 复旦大学 | Integrated digital electrostatic potentiometer |
| CN2684271Y (en) * | 2004-03-18 | 2005-03-09 | 张建民 | Experiment display device for teaching |
| CN1734270A (en) * | 2004-08-10 | 2006-02-15 | 英业达股份有限公司 | Static eliminating system with electric quantity monitoring function and electric quantity monitoring method thereof |
| CN202066903U (en) * | 2011-05-16 | 2011-12-07 | 华南理工大学 | Intelligent device suitable for static dynamic potential real-time test |
| CN202422536U (en) * | 2012-02-14 | 2012-09-05 | 王伟 | Electronic circuit experiment box for circuit test |
| CN203055270U (en) * | 2012-12-07 | 2013-07-10 | 山东省远大网络多媒体股份有限公司 | Digital electrostatic experiment device |
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Address after: Xinluo Avenue high tech Zone of Ji'nan City, Shandong province 250101 Xinsheng No. 1299 Building 2 building 13-1 Patentee after: Shandong Yuanda Runwe education Polytron Technologies Inc Address before: 250101 Shandong city of Ji'nan province high tech Zone Shun Road No. 1, Qilu Software Park Building Room 1202 Patentee before: Shandong Yuanda Net & Multimedia Co., Ltd. |